The matches biggest talking point however came in extra time, when Chelsea winger Willian was adjudged to have dived in the box by referee Graham Scott, who subsequently chose to book the Brazilian forward.

Video official Mike Jones did not think there was a clear and obvious error with referee’s decision – so they did not review the situation at length using the newly implemented VAR (video assistant referee) system.

However, upon closer inspection, it was evident that Willian was indeed fouled, leading to heavy criticism from BBC pundits – especially Alan Shearer who called it “a shambles” – as to why VAR was not used to correct Scott’s judgement.

The Blues ended with nine men as Pedro and Alvaro Morata were both dismissed in extra time for two bookings each, with both players shown their first yellows for diving. Morata’s second yellow came for dissent following his reaction to the first booking, however upon second inspection the Spaniard can also claim to have a case for being fouled.

While Chelsea were fortunate to be rescued by Caballero, and ironically Willian who scored the Blues’ final spot-kick, the Chelsea fans, and indeed others, have been left perplexed by the decision on the night …

Introduce VAR (too quickly) and then don’t use it for an easy decision to overrule a yellow card for simulation by Willian and correctly award a penalty. #CHENOR#FACup

@FA@ChelseaFC@willianborges88 Why are referees never held accountable and at the very least fined for their mistakes? If I, like many other people out there, made such a blatant error in a job we would be facing disciplinary action or get the sack! #chelseanorwich#Chelsea

After Bakayoko's flick plays him in, Willian takes a touch past his defender but is caught by his lunging challenge. The ref booked him for diving but there appeared to be contact. Unfortunately, it didn't make it to VAR. 1-1. #CFCpic.twitter.com/95tHmTa6XO